Storybook: Add stories for the panel-color-settings Component

[SainathPoojary]

Part of #67165

What?

This PR adds a Storybook story for the PanelColorSettings component in the block editor, along with JSDoc addition and some adjustments to the README.

Testing Instructions

• Start Storybook by running npm run storybook:dev
• Open Storybook at http://localhost:50240/
• Navigate to "BlockEditor/PanelColorSettings" in the Storybook sidebar
• Test the stories

Screenshots or screencast

2024-12-20.09-58-15.mp4

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Co-authored-by: SainathPoojary <[email protected]>

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